doc: add some commonly used labels up front
From the last onboarding session I think it would be good to add two commonly used lables to the section which is linked from the onboarding doc.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
From the last onboarding session I think it would be good to add two commonly used lables to the section which is linked from the onboarding doc.